iOS 12.4 (build 16G5077a) is an official Apple over-the-air update for the iPhone 6, released on 2019-07-16T17:39:38Z. The update package is 294.87 MB. This is a delta (partial) update that requires 12.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e657986e3ea01ce8fa35d67dd290b7cf2686f077.zip.